Lubricating device for hydraulic machines having an adjustable-blade runner

Claim 1

IN A HYDRAULIC TURBINE OF THE TYPE HAVING RUNNER BLADES ADJUSTABLY SUPPORTED IN BEARINGS WITHIN A RUNNER HUB AND A SERVO MOTOR FOR ADJUSTING SAID RUNNER BLADES INCLUDING A FLUID ACTUATED PISTON AND ACTUATING SHAFT INTERCONNECTED WITH THE RUNNER BLADES SO THAT LONGITUDINAL MOVEMENT OF SAID PISTON PRODUCES COORDINATE ROTATION OF SAID BLADES, THE IMPROVEMENT ESSENTIALLY CONSISTING OF A LUBRICATION SYSTEM FOR SAID BEARINGS COMPRISING, FLUID PASSAGE MEANS IN SAID PISTON INTERCONNECTING THE OPPOSING SIDES OF SAID PISTON, SAID FLUID PASSAGE MEANS BEING SUFFICIENTLY RESTRICTED TO SUBSTANTIALLY PROVENT EQUALIZATION OF THE PRESSURE ON EITHER SIDE OF SAID PISTON WHILE ALLOWING PASSAGE OF THE ACTUATING FLUID, AND FURTHER MEANS PROVIDING A CONTINUOUS CONNECTION BETWEEN SAID FLUID PASSAGE MEANS AND SAID BEARINGS FOR CONVEYING THE ACTUATING FLUID TO SAID BEARINGS, SAID FURTHER MEANS INCLUDING RESERVOIR MEANS BETWEEN SAID FLUID PASSAGE MEANS AND SAID BEARINGS FOR PROVIDING CONTINUOUS PRESSURE TO SAID BEARINGS.