Patent ID: 8919499

Claim:
A circuit for feeding oil to rolling bearings in a turbomachine, the circuit comprising: an oil supply; an oil duct connecting the oil supply to a plurality of lubrication enclosures connected in parallel and each of the lubrication enclosures containing at least one rolling bearing; an oil feed pump disposed in the oil duct between the oil supply and the lubrication enclosures in order to take oil from the oil supply and deliver the oil to the rolling bearings; and an oil recovery pump connected downstream from each lubrication enclosure in order to recover the oil that has been fed to the rolling bearings and return the oil to the oil supply; a pressurizing valve placed in the oil duct between the oil feed pump and the lubrication enclosures, said pressurizing valve being adapted to open when a pressure at an inlet of the pressurizing valve exceeds a predetermined threshold pressure; a branch connection duct in direct fluid communication with the inlet of the pressurizing valve and one of the lubrication enclosures, the one of the lubrication enclosures being always fed with oil via the branch connection duct even when the pressure at the inlet of the pressurizing valve has not reached the predetermined threshold; and means for feeding the lubrication enclosures at a small oil flow rate when the pressure at the inlet of the pressurizing valve has not reached the predetermined threshold pressure, wherein an inlet of the branch connection duct is placed in the oil duct upstream of the inlet of the pressurizing valve and an outlet of the branch connection duct is placed in the one of the lubrication enclosures, and wherein the pressurizing valve is in direct fluid communication with the one of the lubrication enclosures.