Centrifugal lubricating oil pump of an exhaust gas turbocharger

In a centrifugal lubricating oil pump of an exhaust gas turbocharger having a casing and shaft bearing for supporting a turbocharger shaft, said lubricating oil pump comprising a pump rotor located on the turbocharger shaft which pump rotor is provided with air vent ducts, an oil suction pipe having a lower end which communicates with an oil sump and an upper end which communicates with a hollow annular chamber, which chamber receives a rotating annulus of oil during operation due to a centrifugal force effect, wherein the improvement comprises the pump rotor being provided with two laterally located hollow annular chambers and being fastened on the turbocharger shaft between two shaft bearings, the shaft bearings being each located between an oil suction pipe and a hollow annular chamber of the pump rotor, the oil being sucked from the oil sump through injection nozzles and through the shaft bearings.