Drive pinion of an air-oil separator of a turbomachine accessory gearbox

A drive pinion of an air/oil separator of an accessory gearbox of a turbomachine, the air/oil separator being configured to be supplied at the input by an air flow to de-oil and to supply at the output, on the one hand, a de-oiled air flow and, on the other hand, an oil flow by centrifugation, the pinion being configured to drive the separator rotationally along an axis of rotation, the pinion being suited to being mounted facing a passage opening of the separator configured to enable the passage of an air flow to de-oil or a de-oiled air flow, the pinion comprising a central axis extending along the axis of rotation, a toothed peripheral part and a web plate extending between the central axis and the peripheral part, the pinion wherein at least one guiding opening traversing the web plate, said at least one guiding opening defining at least one guiding surface inclined with respect to the axis of rotation in such a way as to guide, parallel to the axis of rotation, an air flow to de-oil into the separator or a de-oiled air flow out of the separator via the guiding opening of the pinion.